[mattnewport]

Programming Pearls is great (I haven't read Hacker's Delight) but it's mostly "programming in the small". I think it would be interesting to see a book that took real world projects and looked at some core piece of them that is particularly elegant or clever. The core of how git manages its data structure for example, or the Quake BSP. In practice most such real code is probably too tangled up with the rest of the project to be very suitable for this approach unfortunately.